He repairs any items that could be salvaged from the properties and sells them as "extra income".
Mr Tang, the father of two teenage children, has never been on the dole in New Zealand, but said he didn't like the idea that Kiwis were shut out of the social security safety net in Australia.
"I'll just be a second-class citizen if I moved there," said Mr Tang, who took up New Zealand citizenship eight years ago.
Mr Tang's home in Dallington was hit by the second earthquake that hit Canterbury in 2011. It was assessed as badly damaged enough to warrant a pay-out.
He considers the Christchurch rebuild as his "pot of gold" and believes it will give him work until he decides to retire.
"The rebuild process is incredibly slow, but that is not necessarily a bad thing," Mr Tang said.
"It just means that there will be jobs, employment and opportunities for many more years to come."